Many scenes from Hello, Me! reminded me a lot of Hi Bye, Mama!, especially because the two shows depict a supernatural event that deeply affects the lives of a variety of people. What's more, both of them deal with parting.

Both shows give off a similar vibe. They both portray the hardships of the workplace, as well as the strong bonds that come with it.

Although these two shows are very different in various aspects, they have a few things in common. Both of them are about a character that travels into another dimension/back in time and goes through many ordeals because of it. The two of them are also romantic comedies.

Both shows have the same concept of focusing on one character's problem every episode and having the main characters make things worse in one way or another. Both main characters don't seem to be human either.

They are extremely similar as they were both written by the same person, aside from the fact that the male lead for both is Lee Jong Suk. The plot is pretty much the same in the two shows: the male lead has a tragic past that that fights for justice or revenge.

Very similar storyline. Both stories show a female ghost who has amnesia and the two villains have pretty much the same background.

They have similar plots. In W, characters from a webtoon come to life while in Memories of the Alhambra, they are from a game. They are also by the same screenwriter.